/Engine/Source/Editor/Sequencer/Public/ISectionLayoutBuilder.h
Pushes a new category onto the layout. If there is a current category, this category will appear as a child of the current category
void PushCategory ( [FName](API\Runtime\Core\UObject\FName) CategoryName, const [FText](API\Runtime\Core\Internationalization\FText) & DisplayLabel, [TFunction](API\Runtime\Core\GenericPlatform\TFunction)< [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [UE::Sequencer::FCategoryModel](API\Editor\Sequencer\MVVM\ViewModels\FCategoryModel) >([FName](API\Runtime\Core\UObject\FName), const [FText](API\Runtime\Core\Internationalization\FText) &)> OptionalFactory )